I am using HP 2000-2116TU laptop and I have installed Ubuntu 10.04 in it (I'm dual booting it along with windows 7). The problem is that there is no audio(no audio in speakers as well as headphone). The sound card in my lap is Realtek HD audio. I guess Ubuntu is not recognising my sound card. Maybe it is the lack of proper drivers. So please help me to fix this problem. The sound card is fine since it works perfectly in windows 7.